Costs are the most important indicators of profitability in any business activity. The forest logistics chain consists of wood, the supplier, the buyer and the producer. Costs arising from the use and operation of forest machines such as forwarders and harvesters should not be forgotten here. The aim of this study was to define and describe all elements of costs. In such an analysis conducted for the most popular machines, costs were assessed in terms of fixed and variable costs. The purpose was to estimate the degree to which the total cost structure is influenced by servicing costs and spare parts costs. Innovation of this study is connected with the collection of actual accounting data.

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